In Situ Study of the Altering Globule Packing-Density during Semisolid Alloy Deformation

Abstract:

Synchrotron radiography experiments are overviewed that directly image semi-solid deformation at the globule-scale. Globular Al-15Cu at 50-60% solid was deformed in direct-shear at 10-2 s-1. Deformation is shown to occur by globule rearrangement without discernible deformation of the individual globules. Globules were found to translate and rotate as quasi-discrete bodies in response to forces acting at globule-globule contacts, similar to liquid-saturated granular materials such as water-saturated sand. Rearrangement caused the globule packing-density (the solid fraction) to adjust by local compaction and local dilation of the globule assembly, and deformation is highly inhomogeneous. During shear, there was a net dilation and strain began to localize into a shear band of decreased solid fraction by the end of the experiments.

• Periodical: Solid State Phenomena (Volumes 192-193)
• Pages: 185-190
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.192-193.185
• Online since: October 2012
• Authors: Christopher M. Gourlay, T. Nagira, Kentaro Uesugi, Hideyuki Yasuda
• Keywords: Dilatancy, Granular, Rheology, Semi-Solid Processing, Synchrotron, X-Ray

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